I took a WaveShare RP2040-Touch-LCD-1.28and made a program to use it as a touchscreen. This is still very much in the beta phase but the proof of concept works. Here’s my GitHub repo for it.
I’m planning on integrating it into my next split near the thumb cluster.
Yes. It does I2C. It’s also a pi Pico core so dual core. So you could use a separate core to drive the screen independently from the keyboard to keep them fast.
Edit: actually the i2C is not exposed on the pins, but you should be able to use the BitBang_I2C library to expose them on any pair of GPIO pins. I’ll try it out and report back.
Edit2: actually, no need for that library you can set virtual I2C to any pins I tried it with another project on the same board.